Process of and apparatus for burning cements



W. E. SNYDER. PROCESS OF AND APPARATUS FOR BURNING CEMEN'TS.

APPLICATION FILED MAY 25. I920.

1,381,026. Patented June 7,1921.

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' I EECS nyde/W 8 Q A; i MEMO w 1 n- ATTORNEY v w. E. SNYDER. PROCESS'OF AND APPARATUS FOR BURNING CEMENTS.

v APPLICATION.FILED MAY25| 1920. 1,381,026.

Patented Me 7, 1921;

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UNITED STATES PATENT OFFIC.

WILLOUGHBY ELWOOD SNYDER, OF .ALLENTO'wiN, PENNSYLVANIA. I

PROCESS OF AND APPARATUS FOR BURNING CEMEN'ES.

SNYDER, a citizen of the United States, residing at Allentown. in the county of Lehigh and State of Pennsylvania, have invented new and useful mprovements in Processes of and Apparatus for Burning Cements, of which the following is a specification.

One obj ect of my present invention is the provision of a process of burning cements which is highly economical 1n the consumption of fuel inasmuch as it effectively averts the dissipation and waste of heat. J

Another object is the provision of an efficient apparatus for carrying out the process.

To the attaimnent of the foregoing the invention consists in the improvement as hereinafter described and'definitely claimed.

In the accompanying. drawings, hereby made a part hereof Figure 1 is a plan view, partly in section, of the apparatus.

Fig. 2 is a longitudinal vertlcal section of the apparatus, w1th some parts in elevation. Fig. 3 is a vertical transverse section taken in the plane indicated by the line 33 of imilar numerals of reference designate corresponding parts in all of the v1ews of the drawings.

In the apparatus illustrated I ut111ze a rotary kiln that is adapted to be turned about its axis through the medium of power applied to the exterior ear 1, or 1n any other manner compatible wit the lplurpose of the invention. The said rotary 'ln includes a lining 2 of fire brick or other approprlate refractory material, and a shell 3 surrounding and spaced from the l1n1ng 2, and appropriately braced as indlcated by 4. The said shell 3 may be of any material suitable to its urpose though I prefer to form it of reticu ated metal and an appropriate plastic covering therefor; the retlculated metal being securely fastened to the bracing means 4 which ma be and preferably is metal frame work. T e outer end of the rota kiln described is disposed in adust c amber 5 which may be and preferably is of the well known construction at present in general use though it may be of any other construction compatible with the purpose of my invention without affecting the same. In accord-.

pacity of automaticall Patented June '3', 1921.

Application filed May 25, 1920. Serial No. 884,055.

ance with my invention the stack or. up-

take 6 is arranged adjacent to the opposite end of the rotary lows that in the practice of my invention the'kiln gases instead of passing into and kiln. From. this it foldirectly up the stack or uptake will be reversed and carried in the direction indicated by the arrows in Figs. 1 and 2- 5. e., between the lining 2 and the shell or casin 3 and in the same direction as the travel 0 the feed. By virtue of this the kiln will be effectively insulated by hot gases, and because of the loss of velocity by the travelin gases a dust arresting effect will be broug t about. Y It will also be appreciated that the shell or casing 3 will serve as a flue having the cacleaning itself because of the rotary action of the kiln.

The -kiln is slightly inclined from the horizontal as is usual, and its lower portion is equipped with a shell 3 which may be and preferably is of the same character as the before described shell or casing 3. The said supplemental shell or casing 3 is spaced from the refractory lining 2 and is provided with a flared or funnel-shaped intake 7. This funnel-shaped intake 7 is disposed adjacent to my novel dust chamber 8, and at its end remote from the dust chamber 8 the supplemental shell or casing 3 is arranged in a hood 9. Manifestly by reason of the construction and arrangement of the supplemental shell or casing 3 the suction or draft will take airinto the kiln at a oint in close roximity to the novel dust 0 amber 8. t such point considerable heat is present due to the radiating action overand around the place of combustion indicated by 20 in Figs. 1 and 2, and in consequence an extremely hot volume of air-i. e., preheated air, will be su plied to the intake 7 of the supplemental s ell or casin 3. From the said point of intake the a1r will take the course indicated by arrows before being discharged with the gases to the uptake 6.

The hood 9 is provided with a discharge opening 10, and in order to effectively prevent the induction of. cold air at the said opening 10 I provide in combination with the .opening a tiltin closure 10", equipped with a counter-weig t 11 and adapted to open under a predetermined weight and dis- In accordance with practice well known in the art, raw cement material is fed by the usual means, indicated by 60 or any other means into the r' ht hand end 21 of the kiln lining 2, and el is fed to the place of combustion 20 preferably under pressure through-a pipe 7 extended longitudinally inward through the hood 9.

The kiln portion or lining 2 extends through the dust chamber 8 while the shell 3- has its inner end disposed in said dust chamber 7 as clearly shown in Figs. 1 and 2, the annular space between the shell 3 and the lining 2 being in communication with the interior of the chamber 2. Manifestly the kiln gases pass from the place of combustion 20 toward the raw-cement-receiving end 21 of the lining 2 and then in reverse direction between the lining 2 and the shell 3 to the dust chamber 8 from whence the gases pass to the uptake 6. It is essential that the uptake or stack 6 be arranged at one side of the vertical plane of the rotary kiln as clearly brought out in Fig. 1, and that the portion of the shell 3 nearest the stack travel downwardly, this to assure the discharge of the dust at the point most remote from the direct draft of-the stock so that the dust will not be picked up and carried out with the gases.

It will be apparent from the foregoing that in the practice of my 1process and the operation of my apparatus t ere is no Waste of fuel, as in the ordinary well known practice in which losses are due to heat extraction by the hot gases passing from the kiln into and directly up the stack. Moreover, by my process and in my apparatus there is no loss of heat by radiation or by the utilization of heat to reheat the inrush of air caused by the dra t necessary to remove the gases.

Having described my invention, what I claim and desire to secure by Letters-Patent, is

1. The fuel economizing process described which consists in supplying preheated. air, at an intermediate point in the length of a kiln, to a chamber about the kiln and which chamber is in communication with one end of the kiln, and conducting the gases discharged at the opposite end of the kiln through a chamber about the kiln, to a dis-.

eencne charge point.

2. The fuel economizing process described which consists in supplying preheated air, at an intermediate point in the length of a kiln,to a chamber about the kiln and which chamber is in communication with one end of the kiln, and conducting the gases discharged at the opposite end of the kiln through a chamber about the kiln, to a discharge located adjacent to the first-named point; the kiln andv chambers being rotated about a longitudinal axis.

3. The fuel economizing process described which consists in supplying preheated air, at an intermediate point in the length (if a kiln, to a chamber about the kiln and which chamlocated adjacent to the first-named her is in communication with one end of charged at the opposite end of the kiln through a chamber about the kiln, to a discharge located adjacent to the first-named point; the kiln and chambers being rotated about a lon 'tudinal axis, and the ends of the kiln an chamber being located in hoods or chambers.

i. A kiln rotatable about its axis, hoods or chambers in which the ends of the kiln are disposed, and shells surrounding and spaced from the kiln and arranged with their outer ends in the hoods or chambers and their inner ends adjacent to each other; the inner end of one shell afl'ording an in-. let for heated air and the inner end of the other shell being in communication with a discharge conduit.

5. A kiln rotatable about its axis, hoods or chambers in which the ends of the kiln are disposed, shells surrounding and spaced from the kiln and arranged with their outer ends in the hoods or chambers and their inner ends adjacent to each other, the inner end of one shell afi'ording an inlet for heated air and the inner end of the other shell being in communication with a discharge WELWUGHBY htWOfll) SNYDER.

the ends of the second-named- 

